We'll send you a sheet of blank magnetic material so you can magnetize your own bumper stickers. This is the same strong but flexible material used for our bumper magnets. Material is .020 thick and a brownish black on both sides. All you have to do is apply your bumper sticker to the non-magnetic side of the material, then trim off the excess magnetic material with a pair of scissors, or better yet, a paper cutter.  We use a rotary trimmer for the most precise cuts.

Here are some interesting projects:

Cut a piece of this material to fit over the heat or air conditioning vent in that room that you seldom use. It will seal the vent, preventing air leakage, and help cut your utility bills.  

Glue this material to the back of envelopes. Then slap the envelopes on your fridge or file cabinet to help organize stamps, coupons, etc. 

Or, glue this material to the back of a piece of corrugated cardboard to create a great cat-scratch board. I put a piece of this magnetized cardboard on my front door. Now instead of scratching up my door when they want to go out, our cats dig their claws into the cardboard. I cut a hole in the cardboard for the doorknob to help keep the cardboard from sliding.